import { useState, useRef, useEffect, memo, useCallback } from 'react'
import AudioPlayer from '@/components/media/AudioPlayer'
import {
  ErrorReportButton,
  TestHeader,
  ConfidenceLevel
} from '@/components/review/shared'
import { ConfidenceTestProps } from '@/types/review'

interface FlipMemoryTestProps extends ConfidenceTestProps {}

const FlipMemoryTestComponent: React.FC<FlipMemoryTestProps> = ({
  cardData,
  onConfidenceSubmit,
  onReportError,
  disabled = false
}) => {
  const [isFlipped, setIsFlipped] = useState(false)
  const [selectedConfidence, setSelectedConfidence] = useState<number | null>(null)
  const [cardHeight, setCardHeight] = useState<number>(400)
  const frontRef = useRef<HTMLDivElement>(null)
  const backRef = useRef<HTMLDivElement>(null)

  // 判斷是否已答題（選擇了信心等級）
  const hasAnswered = selectedConfidence !== null

  useEffect(() => {
    const updateCardHeight = () => {
      if (backRef.current) {
        const backHeight = backRef.current.scrollHeight

        // 響應式最小高度設定
        const minHeightByScreen = window.innerWidth <= 480 ? 300 :
                                  window.innerWidth <= 768 ? 350 : 400

        // 以背面內容高度為準，不設最大高度限制
        const finalHeight = Math.max(minHeightByScreen, backHeight)
        setCardHeight(finalHeight)
      }
    }

    // 延遲執行以確保內容已渲染
    const timer = setTimeout(updateCardHeight, 100)

    window.addEventListener('resize', updateCardHeight)
    return () => {
      clearTimeout(timer)
      window.removeEventListener('resize', updateCardHeight)
    }
  }, [cardData.word, cardData.definition, cardData.example, cardData.synonyms])

  const handleFlip = useCallback(() => {
    if (!disabled) setIsFlipped(!isFlipped)
  }, [disabled, isFlipped])

  const handleConfidenceSelect = useCallback((level: number) => {
    if (disabled || hasAnswered) return
    setSelectedConfidence(level)
    onConfidenceSubmit(level)
  }, [disabled, hasAnswered, onConfidenceSubmit])

  return (
    <div className="relative">
      <div className="flex justify-end mb-2">
        <ErrorReportButton onClick={onReportError} />
      </div>

      {/* 翻卡容器 */}
      <div
        className={`relative w-full ${disabled ? 'pointer-events-none opacity-75' : 'cursor-pointer'}`}
        onClick={handleFlip}
        style={{
          perspective: '1000px',
          height: `${cardHeight}px`,
          minHeight: '400px',
          transition: 'height 0.4s cubic-bezier(0.4, 0, 0.2, 1)'
        }}
      >
        <div
          style={{
            position: 'relative',
            width: '100%',
            height: '100%',
            transformStyle: 'preserve-3d',
            transition: 'transform 0.6s cubic-bezier(0.4, 0, 0.2, 1)',
            transform: isFlipped ? 'rotateY(180deg)' : 'rotateY(0deg)'
          }}
        >
          {/* 正面 */}
          <div
            ref={frontRef}
            className="absolute w-full h-full bg-white rounded-xl shadow-lg hover:shadow-xl"
            style={{ backfaceVisibility: 'hidden' }}
          >
            <div className="p-8 h-full">
              <TestHeader
                title="翻卡記憶"
                cefr={cardData.cefr}
              />

              <div className="space-y-4">
                <p className="text-lg text-gray-700 mb-6 text-left">
                  點擊卡片翻面，根據你對單字的熟悉程度進行自我評估：
                </p>

                <div className="flex-1 flex items-center justify-center mt-6">
                  <div className="bg-gray-50 rounded-lg p-8 w-full text-center">
                    <h3 className="text-4xl font-bold text-gray-900 mb-6">{cardData.word}</h3>
                    <div className="flex items-center justify-center gap-3">
                      {cardData.pronunciation && (
                        <span className="text-lg text-gray-500">{cardData.pronunciation}</span>
                      )}
                      <div onClick={(e) => e.stopPropagation()}>
                        <AudioPlayer text={cardData.word} />
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>

          {/* 背面 */}
          <div
            ref={backRef}
            className="absolute w-full h-full bg-white rounded-xl shadow-lg"
            style={{
              backfaceVisibility: 'hidden',
              transform: 'rotateY(180deg)'
            }}
          >
            <div className="p-8 h-full">
              <TestHeader
                title="翻卡記憶"
                cefr={cardData.cefr}
              />

              <div className="space-y-4 pb-6">
                {/* 定義區塊 */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <h3 className="font-semibold text-gray-900 mb-2 text-left">定義</h3>
                  <p className="text-gray-700 text-left">{cardData.definition}</p>
                </div>

                {/* 例句區塊 */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <h3 className="font-semibold text-gray-900 mb-2 text-left">例句</h3>
                  <div className="relative">
                    <p className="text-gray-700 italic mb-2 text-left pr-12">{cardData.example}</p>
                    <div className="absolute bottom-0 right-0" onClick={(e) => e.stopPropagation()}>
                      <AudioPlayer text={cardData.example} />
                    </div>
                  </div>
                  <p className="text-gray-600 text-sm text-left">{cardData.exampleTranslation}</p>
                </div>

                {/* 同義詞區塊 */}
                {cardData.synonyms && cardData.synonyms.length > 0 && (
                  <div className="bg-gray-50 rounded-lg p-4">
                    <h3 className="font-semibold text-gray-900 mb-2 text-left">同義詞</h3>
                    <div className="flex flex-wrap gap-2">
                      {cardData.synonyms.map((synonym, index) => (
                        <span
                          key={index}
                          className="bg-white text-gray-700 px-3 py-1 rounded-full text-sm border border-gray-200"
                        >
                          {synonym}
                        </span>
                      ))}
                    </div>
                  </div>
                )}
              </div>
            </div>
          </div>
        </div>
      </div>

      {/* 信心等級評估區 - 使用新元件 */}
      <div className="mt-6">
        <ConfidenceLevel
          selectedLevel={selectedConfidence}
          onSelect={handleConfidenceSelect}
          disabled={disabled || hasAnswered}
        />
      </div>
    </div>
  )
}

export const FlipMemoryTest = memo(FlipMemoryTestComponent)
FlipMemoryTest.displayName = 'FlipMemoryTest'